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    Öğe
    Numerical investigation of flow field on ribbed surfaces using impinging jets
    (Gazi Univ, Fac Engineering Architecture, 2017) Calisir, Tamer; Caliskan, Sinan; Kılıç, Mustafa; Başkaya, Şenol
    This paper presents the numerical investigation of the flow field of triangular and square ribbed surfaces under a 7x3 rectangular array of circular impinging air jets. The effect of Re number, jet-to-plate distance (H/d) and rib geometry on fluid flow characteristics was examined. Firstly, the mathematical formulation and boundary conditions were presented and afterwards the numerical model was verified with experimental results from the literature. Velocity contours were shown and axial and radial velocity distributions were presented. Additionally, the turbulence kinetic energy distribution was shown. A separation of the jet flow occurs for square ribbed surfaces before impingement. For square ribbed surfaces the separation of the jet occurs at a higher location with increasing inlet velocity. Wall jets interact more effectively for the case of H/d=2. The velocity values of the wall jets for the case of triangular ribbed surface is therefore higher.
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    Öğe
    Numerical investigation of heat transfer using impinging jets on triangular and square ribbed roughened walls
    (Turkish Society for Thermal Science and Technology, 2017) Calisir, Tamer; Caliskan, Sinan; Kiliç, Mustafa; Başkaya, Şenol
    This paper presents a heat removal study on triangular and square ribbed surfaces under an array of impinging air jets. The investigation was carried out using nozzles with a 7x3 rectangular array of circular jets. The effect of Re number, jet-to-plate distance, and rib arrangement on heat transfer and fluid flow characteristics was examined numerically. Two arrangements have been studied. Arrangement A considers the situation when the cooling jets are directed towards the ribs, while arrangement B considers the situation when the jets are directed towards the centre line of the cavity between two ribs. Wall jets of neighboring jets have a stronger interaction with increasing Reynolds number. The lowest and highest local heat transfer for all rib geometries was obtained for H/d=8 and H/d=4-6, respectively. On triangular ribbed surfaces the stagnation point Nusselt number values for arrangement A are significantly higher than the stagnation point Nusselt numbers for arrangement B. © 2017 TIBTD Printed in Turkey.
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    Öğe
    NUMERICAL INVESTIGATION OF HEAT TRANSFER USING IMPINGING JETS ON TRIANGULAR AND SQUARE RIBBED ROUGHENED WALLS
    (Turkish Soc Thermal Sciences Technology, 2017) Calisir, Tamer; Caliskan, Sinan; Kılıç, Mustafa; Başkaya, Şenol
    This paper presents a heat removal study on triangular and square ribbed surfaces under an array of impinging air jets. The investigation was carried out using nozzles with a 7x3 rectangular array of circular jets. The effect of Re number, jet-to-plate distance, and rib arrangement on heat transfer and fluid flow characteristics was examined numerically. Two arrangements have been studied. Arrangement A considers the situation when the cooling jets are directed towards the ribs, while arrangement B considers the situation when the jets are directed towards the centre line of the cavity between two ribs. Wall jets of neighboring jets have a stronger interaction with increasing Reynolds number. The lowest and highest local heat transfer for all rib geometries was obtained for H/d=8 and H/d=4-6, respectively. On triangular ribbed surfaces the stagnation point Nusselt number values for arrangement A are significantly higher than the stagnation point Nusselt numbers for arrangement B.